[SI-LIST] Re: off-diagonal resistance and conductance elements

From: "D G" <dgun@xxxxxxxxxx>

To: si-list@xxxxxxxxxxxxx

Date: Wed, 19 Feb 2003 22:56:47 +0800

I haven't heard of this B-matrix before. Do you have any references?
Daniel
From: "Zabinski, Patrick J." >
>
> > With C, if the on-diagonal elements are SELF (not BULK), then the
> > on-diagonal element will change if the coupling conductors
> > were removed
> > while not disturbing the ground reference.
> >
>
> Please correct me if I'm wrong, but...
>
> Specific to the "C" matrix, several EM tools do not
> output a "capacitance" matrix. Instead, they output
> an "electrostatic induction" matrix (let's call it
> the "B" matrix), and it's quite common/easy to get
> them confused.
>
> Where C11 is considered to be the self capacitance of
> a trace (i.e., capacitance of the trace to the ground
> plane), B11 is the capacitance of the trace to all
> other elements (i.e., planes, traces, etc.) assuming
> they were all at ground potential.
>
> Where C12 is the mutual capacitance between Trace 1
> and Trace 2, B11 is the negative of that.
>
> A simple translation is necessary between the two:
>
> C11 = B11 + B12 + B13 + ...
> C12 = -B12
> C13 = -B13
> .
> .
> .
>
> Pat
> ------------------------------------------------------------------
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